Berkeley CSUA MOTD:Entry 16564
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2025/07/08 [General] UID:1000 Activity:popular
7/8     

1999/9/22-24 [Computer/SW/Apps/Media, Computer/SW/Unix] UID:16564 Activity:high
9/21    What is a journaling file system (e.g. BeOS?) ?
        \_ I work on one (VxFS), if you want you can mail me. --aaron
        \_ If you know anything about databases, it's just a transaction log.
           (inodes, directory structures, etc.).
           Some versions log all changes to all blocks on disks, others just
           to the filesystem structure (inodes, directory structures, etc.).
           Either way, no more fsck'ing.
                \_ But isn't that a Log file system? Whats the diff
                   between a journaling FS and a Log FS?
                        \_ Jargon.
                        \_ Different companies, different products,
                                same concept.
                   \_ A journalling file system *contains* a log that it can
                      use (like databases) to recover after crashes.  A log-
                      structured file system *is* a log -- it doesn't actually
                      store your files anywhere except the log.  This means
                      read performance is often significantly worse than with
                      an ordinary filesystem.

                      Journalling file systems are in wide commercial use;
                      log-structured file systems are a (dead, AFAIK) research
                      area.
                      \_ log-structured file systems are useful for media like
                         flash memory which are have high erase/overwrite
                         overhead.
2025/07/08 [General] UID:1000 Activity:popular
7/8     

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